Mission X is comprised of the all new Mission 1.0 core with Magnetite....you will notice the core is black...it is softer so it transmits energy to the pins better, it will bond with the outer core better....and it is easier to drill....The cover is the latest cover from the Ebonite R and D Team, the XL1350. This groundbreaking cover and core combination provides the most continuation down lane in the Mission Series....truly the best of the Mission Series! Is your Mission complete yet??